diff --git a/src/AcDream.App/Rendering/TerrainAtlas.cs b/src/AcDream.App/Rendering/TerrainAtlas.cs
index d49610e..c0d488e 100644
--- a/src/AcDream.App/Rendering/TerrainAtlas.cs
+++ b/src/AcDream.App/Rendering/TerrainAtlas.cs
@@ -183,13 +183,17 @@ public sealed unsafe class TerrainAtlas : IDisposable
             layerIdx++;
         }
 
-        gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
+        // A.5 T19: generate mipmaps + trilinear + 16x anisotropic for distant-LB quality.
+        gl.GenerateMipmap(TextureTarget.Texture2DArray);
+        gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.LinearMipmapLinear);
         gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
         gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
         gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
+        // GL_TEXTURE_MAX_ANISOTROPY = 0x84FE (GL_EXT_texture_filter_anisotropic / ARB_texture_filter_anisotropic).
+        gl.TexParameter(TextureTarget.Texture2DArray, (TextureParameterName)0x84FE, 16.0f);
         gl.BindTexture(TextureTarget.Texture2DArray, 0);
 
-        Console.WriteLine($"TerrainAtlas: {layerCount} terrain layers at {maxW}x{maxH}");
+        Console.WriteLine($"TerrainAtlas: {layerCount} terrain layers at {maxW}x{maxH} (mipmaps+aniso16x)");
 
         // ---- Alpha atlas (new in Phase 3c.2) ----
         // texMerge is guaranteed non-null here: the early return above exited